OPENCORES.ORG

Thank you Mark! I'll compare that part with the one I am currently 
using. It is SN65220 from TI.

Tom

Marc Reinig <mreinig@p...> írta:

> 
> Try
> 
> http://www.semtech.com/pdf/rclamp0504m.pdf
> 
> or similar products.
> 
> Marc Reinig
> System Solutions
> 
> > -----Original Message-----
> > From: usb-bounces@o...
> > [mailto:usb-bounces@o...]On Behalf Of Paal Tamas
> > Sent: Tuesday, February 10, 2004 9:14 AM
> > To: Discussion list about free, open source USB IP core
> > Subject: RE: [usb] USB HUB IPCore
> >
> >
> > Marc,
> >
> > The circuit works in the 50v...800v region. In the 50v...150v region it
> > works fine without any galvanic isolation, but going higher with the
> > system bus voltage, the USB communication fails.
> > The USB functionality is integrated into the microcontroller,
> > that's why I
> > cannot put the isolation between the USB controller and the micro.
> >
> > The main problem is the ground loop, that can develope, if I directly
> > connect the USB into the PC. (The PC ground and the power 
ground of
> > the circuit is (at least) capacitively connected, so after the USB
> > connection is made, another ground connection developes, making 
a
> > big ground loop.)
> >
> > Tom
> >
> > Marc Reinig  írta:
> >
> > > What are the specs of your high voltage problem? 50V, 500V,
> > 5000V, ...
> > >
> > > Why not isolate the USB chip from the high voltage instead of 
trying to
> > > isolate D+/D-?
> > >
> > > Marc Reinig
> > > System Solutions
> > >
> > > > -----Original Message-----
> > > > From: usb-bounces@o...
> > > > [mailto:usb-bounces@o...]On Behalf Of Paal Tamas
> > > > Sent: Monday, February 09, 2004 5:15 AM
> > > > To: usb@o...
> > > > Subject: [usb] USB HUB IPCore
> > > >
> > > >
> > > > Hi,
> > > >
> > > > Is there anyone who ever thought about making a Full Speed 
USB
> > HUB
> > > > IP core?
> > > >
> > > > Why I need that?:
> > > > I am developing a USB interface for a high voltage device, and 
was
> > > > thinking about a way, to galvanically isolate the USB port (e.g. 
the
> > PC)
> > > > from the rest of the circuit.
> > > > I know, that there are this kind of gadgets on the market, but 
they
> > are
> > > > a bit expensive for my application (200..300USD).
> > > > I thing the best way to do this, is to implement the USB device 
into
> > an
> > > > FPGA, and isolate the signals from the FPGA to the SIE. I
> > will do this
> > in
> > > > the future, but now I have to keep my USB chip, and put a 
(cheap)
> > > > isolation outside the circuit.  This isolator could be a HUB
> > implemented
> > > > in an FPGA with isolated lines to the SIE(s).
> > > >
> > > > Please notify me, if you have a USB HUB IP core implementation 
in
> > mind.
> > > >
> > > > Tom
> > > >
> > > >
> > > >
> > > > _______________________________________________
> > > > http://www.opencores.org/mailman/listinfo/usb
> > >
> > >
> > > _______________________________________________
> > > http://www.opencores.org/mailman/listinfo/usb
> > >
> > >
> > >
> >
> >
> >
> >
> >
> > _______________________________________________
> > http://www.opencores.org/mailman/listinfo/usb
> _______________________________________________
> http://www.opencores.org/mailman/listinfo/usb
> 
> 
> 